Smart Export Guarantee for UK businesses - 2026
SEG pays commercial solar owners for every kWh they export to the grid. Rates run from 4p to 18p/kWh depending on tariff - here's how to pick the right one and when a PPA is a better route.
Key takeaways
- The Smart Export Guarantee obliges licensed UK energy suppliers to pay businesses for surplus solar electricity exported back to the grid.
- Commercial SEG rates typically range from 5p to 15p per kilowatt-hour, requiring an Ofgem-compliant smart or half-hourly export meter.
- Businesses often yield higher returns by self-consuming solar power or negotiating commercial Power Purchase Agreements rather than relying solely on SEG.
Leading SEG tariffs in 2026
Octopus Outgoing Fixed
~15p/kWh flat. One of the best fixed rates for commercial systems under 5 MW.
Octopus Outgoing Agile
Tracks half-hourly wholesale - can average 12–18p/kWh but requires a smart meter and shifts risk to the exporter.
E.ON Next Export Exclusive
~16.5p/kWh for E.ON supply customers only. Solid mid-market option.
British Gas Export & Earn Flex
6.4p/kWh - lower headline rate but no supply-tie requirement.
Rates change often - check with each supplier before signing. Systems above 5 MW need a PPA route to market.
What's needed to claim SEG
- MCS or equivalent certificate for the install.
- Half-hourly (SMETS2) export-capable smart meter.
- MPAN and metering details for the site.
- System size at or below 5 MW.
Related reading
FAQ
Can businesses claim the Smart Export Guarantee?
Yes. Any solar system up to 5 MW installed by an MCS-certified installer can register for SEG. Above 5 MW you sell through a PPA or the wholesale market rather than SEG.
What's the best SEG tariff for a business in 2026?
Octopus Outgoing Fixed at around 15p/kWh is currently the best broad-market SEG rate. E.ON Next Export Exclusive is competitive if you're already an E.ON business supply customer. Rates change frequently - check before signing.
Do I need a smart meter for SEG?
Yes - SEG requires a half-hourly export-capable smart meter (SMETS2). Most UK commercial supplies now have this; if not, your supplier will install one before SEG payments start.
Is SEG better than a PPA for large systems?
For arrays up to a few hundred kWp, SEG usually wins on simplicity and no long-term contract. Above 500 kWp and especially over 1 MW, a corporate PPA or route-to-market agreement typically achieves higher realised export prices and can add merchant floor pricing.
How do I register for SEG?
Get your MCS certificate from the installer, your MPAN and meter details, then apply directly with the SEG licensee of your choice - you can choose any, regardless of who supplies your import electricity. Registration typically takes 2–4 weeks.
Design a system that maximises export income
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